SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7c0220ba4882a337d28a179ff947b0bfae7c79eba3d8205305df8518aeb474' 
  AND token = 'nWpeV6ZwCA2hnBgW13kyjlwmsdCqWa5G8Fv7yizwRLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}